The Business Pyramid
It's ironic how the majority of people get paid so little to do the most undesirable things in a corporation (i.e., janitor) while a minority in the enterprize literally owns and dominates the labor and decision making process and gets paid big bucks to do it! If drawn on paper this would such a structure would look fairly similar to a an Egyptian pyramid - both literally and physically. By physically it is meant that the 90% which creates the pyramid is the large mass occupying the bottom half while the 10% which stand to reap the most sends orders from the top just like a Pharoh.
In the business world mid-low level employees commonly tend to be the losers in the enterprize as they are usually the least paid, and sometimes looked upon as a mere “expense” by top management. If this wasn’t the case then so many pink layoff slips would not be handed out during a recession, for instance, rather than a pay cut in management's salaries or restriction of stock options.
Though hard work in the work place is also a major contributing factor towards the internal promotion the final decision lies with the various levels of management. At the top promotional levels (executive class) management and/or the board of directors decide which employees are valuable, contributing assets to the business as a whole, and which are not and the employees favoured are given promotions and made executives.